This add-on to Empire Earth pushes the envelope even further with 3 all new campaigns from the Roman Empire to WWII and finally into the future. Players have conquered new lands before, but this time to continue the dominance of their civilization, they must cross the boundaries of space. New space ships and docking ports are just the beginning. In Empire Earth: The Art of Conquest, each of the 21 pre-designed civilizations will gain unique special powers, buildings or units.